| Clue | Source | Date |
|---|---|---|
| User of all the black keys | Newsday | 03 May 2025 |
| Key in which 'Tristan und Isolde' concludes | The Chronicle of Higher Education | 09 Nov 2018 |
| Key in which "Tristan und Isolde" concludes | ||
| Five-sharp scale | Newsday | 17 Dec 2015 |
| Five-sharp scale | ||
| Scale using all the black keys |